Battery expansion pack



FIG. 1 is a front perspective view of a battery expansion pack of my new design;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is an opposite side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the article that form no part of the claim. 

CLAIM I claim the ornamental design for a battery expansion pack, as shown and described. 